O2 Oxygen Sensor Upstream Downstream for Toyota Avalon (2005-2006) 3.5L
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Direct-Fit O2 Oxygen Sensor Kit for 2005-2006 Toyota Avalon (XX30)
What it Does: The complete upstream and downstream O2 oxygen sensor kit replaces degraded factory monitoring probes on the 2005-2006 Toyota Avalon to restore closed-loop fuel trim accuracy and eliminate emissions fault codes.
The Stock Toyota Avalon Sensor Degradation
The 2GR-FE engine relies on rapid feedback from its factory sensors to balance stoich air-fuel ratios. Over extended mileage, thermal cycling and exhaust carbon contaminate the sensitive internal zirconia elements in the factory XX30 chassis sensors. This degradation leads to delayed switching responses, false catalytic converter inefficiency codes (P0420/P0430), rough idle, and unmetered fuel dumping that accelerates catalytic core breakdown.
The Engineering Solution
Engineered for exact electrical resistance and fast transient thermal response, this matched 4-piece sensor set restores factory closed-loop engine management. Constructed with dual-layer protective stainless steel shields and high-temperature ceramic sensing cells, these direct-fit sensors resist carbon fouling and thermal shock. Pre-crimped OE-spec harnesses ensure seamless bank-1 and bank-2 data feedback without splicing, maintaining precise stoichiometry and preserving downstream catalytic efficiency.
What's Included
- 1x Upstream Oxygen Sensor (OE Equivalent: 234-9050)
- 1x Upstream Oxygen Sensor (OE Equivalent: 234-9041)
- 1x Downstream Oxygen Sensor (OE Equivalent: 234-4064)
- 1x Downstream Oxygen Sensor (OE Equivalent: 234-4260)
Technical Specifications
| Fitment | 2005-2006 Toyota Avalon |
|---|---|
| Engine / Chassis | 2GR-FE / XX30 |
| Stock Output | 268 hp / 248 lb-ft |
| Replaces OEM Part # | S4-4064, 234-4260, 234-9041, 234-9050, 2344046, 2344260, 2349041, 2349050, 2344064 |
Compatibility
- 2005 Toyota Avalon 3.5L V6 (XL, Touring, XLS, Limited)
- 2006 Toyota Avalon 3.5L V6 (XL, Touring, XLS, Limited)
Frequently Asked Questions & Fitment Warnings
Does this fit the XX30 Avalon?
Yes, this is a direct fit for the 2005-2006 Toyota Avalon equipped with the 2GR-FE 3.5L V6 engine.
Do these sensors require wire cutting or repinning?
No, all four sensors feature OE-specification weather-pack connectors for a plug-and-play installation without wire modification.
The Toyota Precision Standard
Maintain the smooth, efficient performance your Toyota V6 was built to deliver. Precise oxygen feedback protects your engine's long-term emissions integrity, clears persistent CEL faults, and restores original fuel economy.
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